Question

A motorcyclist drives from place A to B with a uniform speed of 30 km hrl and returns from place B to A
with a uniform speed of 20 km h Find his average speed.
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Answer 1

Answer:

Let the length of the line segment AB be x m

The time taken is given as t=distance covered/speed

Total time = t

1

+t

2

=

30

x

+

20

x

=

60

5x

h

Average speed = Total distance/Total time =

5x/60

2x

=24 km/h

Explanation:

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Answer 2

Explanation:

Let the length of the line segment AB be x m

The time taken is given as t=distance covered/speed

Total time =t1 + t2 = x/30 + x/20= 5x/60h

Average speed = Total distance/Total time =

2x/5x/60

2x × 60/ 5x = 120x/5x

= 24km/h